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3.4. Setting up an IdM Client Through Kickstart

A Kickstart enrollment automatically adds a new system to the IdM domain at the time Red Hat Enterprise Linux is installed. For details on Kickstart, see Kickstart Installations in the Installation Guide.
Preparing for a Kickstart client installation includes these steps:

3.4.1. Pre-creating a Client Host Entry on the IdM Server

  1. Log in as admin:
    $ kinit admin
  2. Create the host entry on the IdM server, and set a temporary password for the entry:
    $ ipa host-add client.example.com --password=secret
    The password is used by Kickstart to authenticate during the client installation and expires after the first authentication attempt. After the client is successfully installed, it authenticates using its keytab.

3.4.2. Creating a Kickstart File for the Client

A Kickstart file used to set up an IdM client must include the following:
  • The ipa-client package in the list of packages to be installed:
    %packages
    @ X Window System
    @ Desktop
    @ Sound and Video
    ipa-client
    ...
    See Package Selection in the Installation Guide for details.
  • Post-installation instructions that:
    • ensure SSH keys are generated before enrollment
    • runs the ipa-client-install utility, specifying:
      For example:
      %post --log=/root/ks-post.log
      
      # Generate SSH keys to ensure that ipa-client-install uploads them to the IdM server
      /usr/sbin/sshd-keygen
      
      # Run the client install script
      /usr/sbin/ipa-client-install --hostname=client.example.com --domain=EXAMPLE.COM --enable-dns-updates --mkhomedir -w secret --realm=EXAMPLE.COM --server=server.example.com
    For a non-interactive installation, add also the --unattended option.
    To let the client installation script request a certificate for the machine:
    • Add the --request-cert option to ipa-client-install.
    • Set the system bus address to /dev/null for both the getcert and ipa-client-install utility in the kickstart chroot environment. To do this, add these lines to the post-installation instruction file before the ipa-client-install instruction:
      # env DBUS_SYSTEM_BUS_ADDRESS=unix:path=/dev/null getcert list
      # env DBUS_SYSTEM_BUS_ADDRESS=unix:path=/dev/null ipa-client-install

    Note

    Red Hat recommends not to start the sshd service prior to the kickstart enrollment. While starting sshd before enrolling the client generates the SSH keys automatically, using the above script is the preferred solution.
    See Post-installation Script in the Installation Guide for details.
For details on using Kickstart, see How Do You Perform a Kickstart Installation? in the Installation Guide. For examples of Kickstart files, see Sample Kickstart Configurations.